Does ‘our old man’ refer to a single believer’s old man, or does it relate to that which all believers were when they were in Adam? And what is the relationship with Romans 6:6 and Ephesians 4:22?

This text is from a transcript of a talk by David Gooding, entitled ‘The Gospel of Jesus Christ’ (1994).

We'd better start, I think, by reading Ephesians 4:22. That says that 'you put away, as concerning your former manner of life, the old man, which waxeth corrupt after the lusts of deceit.' If we have to put him away, he's still there, is he? Romans 6 appears to say that this old man was crucified with Christ. How do you reconcile those two things? Well, one way is to say that in Romans 6 Paul is looking on all human beings as belonging to the race of Adam, the race as created by God originally and gone astray and become corrupt. And the whole lot together is the old man as distinct from that new race, that new human race that God has commenced, starting all over afresh, with Christ our Lord, the second man, the Lord from heaven. So that God's way of redemption is not just to put right the old race, but to start a new race. And now, instead of starting from Adam, going wrong and being repaired, you start with Christ, and all who are joined to him and share his life that they derived from him. They're a new race. And in that light, the old lot, so to speak, were crucified with Christ. That's God's judgment on them. They were for execution because they were hopelessly wrecked, and sinful into the bargain. God's judgment on them is from start to finish, the whole thing. The only way to deal with it is to execute it and bury it, and you start again with Christ. And in that sense, when we receive Christ, then his death is counted ours. That's the old, whoever it was, Mr Smith or Mrs Jones, finished, and a new entity begins, which is the new life derived from Christ.

While that is so, if that is what it means, you still have the practical thing in Ephesians 4 that we are to put off the old man. So he's still around, then? And so here, people say, 'The old man is the old way of living, the way we used to behave, the kind of person we were before we were converted. That we have to put off, and put on the new way of living which is the life and behaviour of Christ.